/*
 * This file is part of Dependency-Track.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * SPDX-License-Identifier: Apache-2.0
 * Copyright (c) OWASP Foundation. All Rights Reserved.
 */
package org.dependencytrack.model.validation;

import com.asahaf.javacron.InvalidExpressionException;
import com.asahaf.javacron.Schedule;

import jakarta.validation.ConstraintValidator;
import jakarta.validation.ConstraintValidatorContext;

/**
 * @since 4.13.0
 */
public class CronExpressionValidator implements ConstraintValidator<ValidCronExpression, String> {

    @Override
    public boolean isValid(final String value, final ConstraintValidatorContext context) {
        if (value == null) {
            // null-ness is expected to be validated using @NotNull
            return true;
        }

        try {
            Schedule.create(value);
            return true;
        } catch (InvalidExpressionException e) {
            return false;
        }
    }

}
